Photos: Alessio Neri SAN FRANCISCO — There’s a point in every wildly successful act’s show when the fans, knowing their role, act out a role or clap, as if on cue, but without having to be prompted. U2 has this, the Stones have this, and Biffy Clyro has it, too.…

Biffy Clyro performs at The Fillmore in San Francisco on March 28, 2017. Alessio Neri/STAFF. No matter how many hard rock musicians I’ve interviewed, I’m still surprised to learn how friendly and pleasant they are in conversation. Last week I spoke to the very charming James Johnston, bassist for…

Biffy Clyro performs at the Great American Music Hall on Feb. 12, 2014. Roman Gokhman/STAFF. Few rock bands in the United Kingdom had as successful of a 2013 as Biffy Clyro. After more than 15 years of sweating it out on stage with a ferocious live show and six…